A pilot test was conducted on two studies, followed by independent
review of each study by two authors for determination of methodological
quality. Disagreements were resolved during meetings between the
authors. The seven-item scale of RoB (Risk of Bias), developed by the
Cochrane Bias Method Group, was used for evaluation of RCT studies.
The Risk of Bias Assessment tool for Non-randomized Studies (RoBANS),
developed by Kim et al. (2013b), was used for non-RCTs. As in the
Cochrane Risk-of-Bias tool, the bias types in RoBANS are selection, performance,
detection, attrition, and reporting biases. However, the domains
of selection and performance biases were modified to include
the selection of participants, confounding variables, and the measurement
of exposure